If the feedback loop of the knee reflex was cut off at any points along its path, then there will be no response of knee reflex.
What does it mean if you don't have a knee reflex?Its results in harm to any part of your reflex arc, which can be due to a basic knee-medicinal condition. Healthcare suppliers can disclose hyporeflexia by spouting your knee with a rubber hammer.
If your doctor taps on a band and there isn't a reflexive movement in the muscle, it's a sign of knee-health matter. Usually, absent reflexes are created by an issue with the nerves in the tendon and muscle. You may have other muscle symptoms along with areflexia, like weakness, or atrophy.
So we can conclude that A decline reflex reply can be related to peripheral knee-nervous system disorders.
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What are the electron and molecular geometries, respectively, for iodine trifluoride, IF3? Electron geometry is trigonal bipyramidal. Molecular geometry is trigonal planar. Electron geometry is trigonal bipyramidal. Molecular geometry is T-shaped. Electron geometry is octahedral. Molecular geometry is T-shaped. Electron geometry is trigonal planar. Molecular geometry is trigonal bipyramidal.
Electron geometry is trigonal bipyramidal. Molecular geometry is T-shaped for iodine trifluoride, IF3.
Trifluoroiodine, often known as iodine trifluoride, has the chemical formula IF3. It is an unstable interhalogen chemical molecule. It has a yellow solid appearance and easily breaks down at temperatures higher than -28°C. Because of IF3's fragility, it is mostly unknown and undiscussed in the scientific community.In light of all of the aforementioned information, this article provides you with a basic introduction to IF3, covering topics such as how to draw its Lewis structure, molecular geometry, or shape of IF3, electron geometry, bond angle, hybridization, polar or non-polar nature, and/or any formal charges present on IF3 atoms.
Complete question:6. What are the electron and molecular geometries, respectively, for iodine trifluoride, IF3?
A. Electron geometry is trigonal bipyramidal.Molecular geometry is T-shaped.
B. Electron geometry is octahedral.Molecular geometry is T-shaped.
C. Electron geometry is trigonal bipyramidal.Molecular geometry is trigonal planar.
D. Electron geometry is trigonal planar.Molecular geometry is trigonal bipyramidal.
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Answer:
The electron geometry of IF3 is trigonal bipyramidal. But the molecular shape of IF3 is T-shaped. The bond angles formed between each atom are close to 90 degrees.
Explanation:
In the molecule C2H4 the valence orbitals of the carbon atoms are assumed to be?
a) dsp hybridized
b) not hybridized
c) sp hybridized
d) sp^3 hybridized
e) sp^2 hybridized
In the molecule C2H4, valence orbitals of the carbon atoms are assumed to be e) sp^2 hybridized.
What is valence orbitals?The set of orbitals that can energetically accept electrons to create chemical bonds is known as the valence shell. The ns and np orbitals in the outermost electron shell make form the valence shell for main-group elements.
The outside electrons engaged in bonding are called valence electrons. A particular atom can have 0 to 7 valance electrons since valance electrons can only exist in the s and p orbitals. Noble gases are atoms that have no valence electrons and dislike forming bonds.
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A compound is found to contain 10.37 % phosphorus, 4.689 % nitrogen, and 84.95 % iodine by weight. The molecular weight for this compound is 298.8 g/mol. What is the molecular formula for this compound
Answer:
P₂N₂I₄
Explanation:
Firstly, we calculate the empirical formula of the compound. To do this we find the moles of each element. Treat the percentages as masses.
The formula for moles is:
[tex]moles = \frac{mass}{relative \: atomic \: mass}[/tex]
The masses of each element are:
Phosphorus = 10.37g
Nitrogen = 4.689g
Iodine = 84.95g
The relative atomic masses of each element are:
Phosphorus = 31.0
Nitrogen = 14.0
Iodine = 126.9
Using these values, we can calculate the moles of each element:
[tex]moles \: of \: phosphorus = \frac{10.37}{31.0} = 0.335[/tex]
[tex]moles \: of \: nitrogen \: = \: \frac{4.689}{14.0} = 0.335[/tex]
[tex]moles \: of \: iodine \: = \: \frac{84.95}{126.9} = 0.669[/tex]
Using the moles, write them in a ratio to find the ratio of moles:
Phosphorus : nitrogen: iodine
0.335 : 0.335: 0.669
The smallest number here is 0.335, so divide each number by 0.335
0.335÷0.335=1
0.335÷0.335=1
0.669÷0.335=1.99... = 2 (round to the nearest whole number)
These numbers are used as the subscripts of each element.
This means that the empirical formula is:
PNI₂
To calculate the molecular formula:
[tex]\frac{molar \: mass \: of \: molecular \: formula}{molar \: mass \: of \: empirical \: formula}[/tex]
The molar mass of empirical formula is adding the molar masses of compound PNI2:
31.0 + 14.0 + 126.9 = 171.9
The molar mass of molecular weight or mass = 298.8 (given from the question)
Substitute these in the formula above:
[tex] \frac{298.8}{171.9} = 1.738...[/tex]
1.738 = 2 rounded to the nearest whole number.
Multiply all the subscripts seen in the empirical formula by the number 2:
PNI₂ × 2 = P₂N₂I₄
John is completing a lab in which he is using the corrosive base sodium hydroxide (NaOH). For this laboratory experiment, what types of safety precautions should he take
Please put on a lab apron. It helps shield clothing from damage and stains. Examining glass for fractures and chips. This damaged or chipped glassware needs to be properly disposed of.
In order to deal with it safely, we must take the appropriate precautions. Skin burns or other skin injury can be brought on by sodium hydroxide. Additionally, it can injure eyes. Learn as much as you can about the chemicals that will be utilized, including any exposure or leak risks. Find the spill kits and learn how to use them. Verify labels and throw away any chemicals that aren't 100 percent pure. For ease of access, alphabetize the lab chemicals. Security is the practice of keeping unwelcome dangers and hazards out of the lab environment.
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What do these two changes have in common?
sauce burning on a stove
firing a clay pot in a hot kiln
Both are caused by cooling
Both converse mass
Both are chemical changes
Both are physical changes
sauce burning on a stove and firing a clay pot in a hot kilnBoth are physical changes. Therefore, option D is correct.
What are physical changes?Physical changes can be defined as changes affecting the state of a chemical substance, but not its composition. Physical changes can be used to separate mixtures into their component compounds, but can not generally be used to separate compounds into elements or simpler compounds.
Physical changes takes place when substances undergo a change that can not change their composition. while the chemical change in which the composition of a substance changes when substances combine or break up to form new substances.
In general a physical change can be consideed as reversible using physical means. A physical change includes a change in physical properties such as change of strength, change of durability, textural change, shape, size, volume and density.
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Two liquids whose boiling points differ considerably can be separated from their mixture by
Answer:
heating the mixture until one liqiid remains
Explanation:
This is because the liquids have different boiling points there fore meaning that one liquid will evaporate begore the other
In a reaction between vinegar and antacid tablets, the antacid is the limiting reagent. At constant pressure and temperature, three tablets produce 600 cm³ of gas.
What volume will six tablets produce?
The volume of gas produced by six tablets would be twice the volume produced by three tablets, or 600 cm³ x 2 = 1200 cm³.
Definition of a gas's volumeUntil they are enclosed in a container, gases lack a definite shape or volume. Gases can expand and contract as they are forced into various container sizes and shapes because of the way their molecules spread out and move randomly.
The volume of the container in which a gas is contained can be used to define the volume of the gas itself.
The volume of a gas reduces as the molecules are crammed closer together when it is compressed. A gas's volume rises when it expands.
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Answer:
1200 cm³.
Explanation:
Draw the structure of the major organic product(s) of the following reaction.
excess Br2
excess OH
The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
The major organic product is 2-bromobutane.
Structure:
CH3 CH2 CH2 CH2 Br
| | |
CH3 CH2 Br
1) The reaction begins with bromine reacting with the 2-methylpropane molecule to form the intermediate 2-bromo-2-methylpropane.
2) The intermediate then reacts with hydroxide ions to form the final product, 2-bromobutane.
3) The final product is a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
The major organic product of this reaction is 2-bromobutane, a saturated hydrocarbon with a bromine atom attached to the second carbon atom.
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A compound is composed of carbon and hydrogen and has an empirical
formula of CH. The molar mass of the compound is experimentally
determined to be 78.12 g/mol. What is the molecular formula for the
compound?
A compound has the empirical formula CH and is made up of carbon and hydrogen. the compound's molecular formula is C6 H6.
How is a molecular compound identified?Compounds that involve a metal binding with a non-metal or a semi-metal will typically exhibit ionic bonding. Molecular compounds are those whose only non-metals or semi-metals contain non-metals. These compounds exhibit covalent bonding.
The compound with the lowest whole number ratio can be found in its empirical formula.
The empirical formula for weight is 12+1=13,
while the molecular formula for weight is 13 78 = 6.
The molecular formula for weight is (CH)n = (CH)6 =C6 H6.
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What is called proton number?
Proton number is called atomic number.
The chemical element's atomic number, also referred to as the nuclear charge number, is determined by the charge number of an atomic nucleus. This is the quantity of protons in the nucleus of each of that element's atoms. The atomic number refers to the number of protons in the nucleus of an atom. The amount of protons in an element determines what kind of element it is.
Both protons and electrons are equal in number in a neutral atom. The mass of an atom, represented by the letter M, is equal to the total of its protons and neutrons in the nucleus.
The number of protons in the atom's nucleus is therefore equal to the atomic number (Z). in an uncharged atom.
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what is the likely composition of the indicator solution when the intermediate or transistion color is observed in step 6
A blend of dyes called a universal indicator gradually changes color throughout a pH range of 4 to 14. The color serves as a direct indicator of pH.
Thymol blue, methyl red, bromothymol blue, and phenolphthalein are the primary ingredients of a universal indicator in the form of a solution. Colors ranging from yellow to red denote an acidic solution, whereas colors ranging from blue to violet denote an alkaline solution and green denotes a neutral solution. Substances called indicators are those whose solutions change color as the pH changes. We refer to these as acid-base indicators. The conjugate base or acid versions of these typically weak acids or bases have various hues because of variations in their absorption spectra.
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Determine the electron geometry (eg) and molecular geometry (mg) of NCl3.
O eg=tetrahedral, mg=trigonal pyramidal
O eg=linear, mg=trigonal planar
O eg=tetrahedral, mg=tetrahedral
O eg=linear, mg=linear
O eg=trigonal planar, mg=bent
The correct answer is : Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons
O eg=tetrahedral, mg=trigonal pyramidal
The electron geometry (eg) of NCl3 is determined by the positions of the electrons around the central atom, nitrogen (N). NCl3 has one lone pair of electrons on nitrogen and three bonding pairs of electrons with chlorine atoms, so the electron geometry is tetrahedral. NCl3's molecular geometry (mg) is determined by the atom positions in the molecule. In a trigonal pyramidal shape, NCl3 has one nitrogen atom in the centre and three chlorine atoms surrounding it. Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons. Electron geometry, also known as electron pair geometry, is the arrangement of electron pairs in a molecule or ion around a central atom. It is determined by the number of electron pairs surrounding the central atom, which includes both bonding pairs and lone electron pairs. The electron geometry can be used to predict the overall shape of a molecule or ion and also helps to understand the polarity of the molecule.
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What is Ghez’s favorite star? Do you have a favorite star? Why or why not?
Andrea Ghez's favorite star is known as SO-2 and it is her favorite star because this star goes around the universe in a short period. I do not have a favorite star because I do not know a lot about stars.
Who is Andrea Ghez?Andrea Ghez is female astrophysicst who was born in the United States known for being one of the few women in the world who have gotten the Nobel Prize in Physics. During her life, Andrea has studied the center of the universe, black holes and the stars. Moreover, she was known for giving a TED talk in whiich she explained about stars and black holes.
What is Andrea's favorite start?In the TED talk given by Andrea Ghez she mentions her favorite star is the SO-2 as "it goes around in only 15 years".
What is my favorite star?I do not have a favorite star because I do not know a lot about stars, although I believe studying them is very interesting.
Note: This question is incomplete; here is the missin information:
TED Talk- Andrea Ghez
"Now, most astronomers have a favorite star, and mine today is a star that's labeled up there, SO-2. Absolutely my favorite star in the world. And that's because it goes around in only 15 years. And to give you a sense of how short that is, the sun takes 200 million years to go around the center of the galaxy"
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Are group 1 or group 2 elements more reactive?
The elements belonging to group 1 are more reactive than elements belonging to group 2.
The elements that belongs to s block elements are hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The nature of alkali metals is soft and shiny in appearance. They have low melting point and are highly reactive in nature and usually tarnish when exposed to air. Sodium (Na) is the most reactive element since it's valence electrons are not tightly held together in the atom. The three elements that are highly reactive are Lithium (Li), Sodium (Na), and potassium (K). The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive.
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Is a mole equal to 1 molecules?
No, one molecule does not make up a mole. In chemistry, the terms "mole" and "molecule" are used interchangeably.
The word "mole" is used to describe a quantity that cannot be expressed in terms of grams or milligrams. A mole thus counts the quantity of atoms, ions, or molecules.
A molecule is a type of chemical that develops when multiple atoms are combined by chemical bonding. Electrical charge does not exist in molecules. A molecule's constituent atoms may come from the same element or from separate elements. Varying molecules have different ratios between these atoms. Molecules are a unit of measurement for the quantity of molecules in a system.
The primary distinction between a mole and a molecule is that a mole is a unit of measurement for amount whereas a molecule is an atomized chemical species.
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What is the molecular formula of a compound whose empirical formula is CH4 and has a molar mass is 32. 086 g/mole?
The molecular formula of a compound whose empirical formula is CH4 and has a molar mass is 32. 086 g/mole is C
The molecular formula of a compound is the actual number and types of atoms that make up a molecule. It gives the exact number of atoms of each element in a molecule.
On the other hand, the empirical formula of a compound represents the simplest whole number ratio of atoms that make up a compound. It gives the lowest whole number ratio of atoms of each element in a molecule.
Multiply the subscripts in the empirical formula by a factor needed to reach the molar mass of the compound. In this case, CH4 has a molar mass of 16.04 g/mol and the compound has a molar mass of 32.086 g/mol.
32.086 g/mol/16.04 = 2
Multiplying the subscripts by 2, the molecular formula of the compound is C2H8.
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What procedures should be followed if a chemical spill occurs?
Prevent the spread of dusts and vapors.Neutralize acids and bases, if feasible. Manage the spread of the liquid.absorb the liquid.Gather and incorporate the cleanup residues. Get rid of the wastes. Decontaminate the area and affected system.
Chemical spills are the uncontrolled launch of a dangerous chemical, both as a strong, liquid or a gas. these spills need to be minimized as tons as possible.
Chemical spills usually result from the dangerous handling of chemical compounds, incorrect chemical storage, chemical garage tank ruptures, incorrect containers for chemical disposal, and failure to eliminate chemical substances in a well timed way.
There are sorts of spills that you can run into: simple Chemical Spills and complex Chemical Spills. easy Chemical Spills are small, confined, and present minimal dangers.
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Using the thermodynamic data provided below, calculate the standard change in entropy when one mole of sodium nitrate is dissolved in water?
S° (J/K•mol)
NaNO3(s) 116.3
Na+(aq) 60.25
NO3–(aq) 146.4
Will the solubility of sodium nitrate increase or decrease if the temperature of the system is increased?
Thermodynamic data is data that relates to the physical properties of a system related to temperature, pressure, and energy.
What is Thermodynamic data?
Thermodynamic data is data that describes the physical properties of a material system in terms of temperature, pressure, and other thermodynamic variables. It is used to predict the behavior of materials in different conditions and to analyze processes such as heat transfer or chemical reactions. It is also used to design and optimize energy systems, such as engines and power plants.
The standard change in entropy when one mole of sodium nitrate is dissolved in water is:
ΔS° = S° (products) - S° (reactants)
ΔS° = (60.25 + 146.4) - 116.3 = 90.3 J/K•mol
The solubility of sodium nitrate will increase if the temperature of the system is increased.
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PLEASE HELP 100 POINTS FOR THIS
A student placed a piece of nickel in silver nitrate solution. Silver metal precipitated and
aqueous nickel (II) nitrate was produced. The student collected the following data:
Mass of beaker 102. 05 g
Mass of beaker with silver 103. 13 g
Mass of nickel before 5. 00 g
Mass of nickel after 4. 69 g
__ Ni + __ AgNO 3 à __ Ag + __ Ni(NO 3 ) 2
Determine the percent yield of silver
Answer:
Explanation:
Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container. To find the volume of the fluid, you simply measure it very carefully in a graduated cylinder.
A chemist prepares a solution of magnesium bromide by measuring out of into a volumetric flask and filling to the mark with distilled water. Calculate the molarity of anions in the chemist's solution.
The assumed or arbitrary molarity of anions in the chemist's solution is found out to be 2.17 M.
Since neither the mass of magnesium bromide and the volume of the volumetric flask are not given, one can assume arbitrary values and you could modify them whenever you want, thus, let 50.0g of magnesium bromide to be the measured out amount of solute and a 250-mL volumetric flask where the solution is prepared, so the final volume of the solution is 250 mL after the addition of distilled water. In this manner, the bromide anions moles, taking into account there are two bromide moles per magnesium bromide moles giving the value of 0.543 mols.
The molarity can be calculated as follows:
M= 0.543 mol Br-/0.250 L= 2.17 M
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A compound is composed of carbon and hydrogen and has an empirical
formula of CH. The molar mass of the compound is experimentally
determined to be 78.12 g/mol. What is the molecular formula for the
compound?
The supplied statement indicates that the compound's molecular formula is (CH)ₙ = CH₆ = C₆H₆
What is the purpose of hydrogen?Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is now most widely employed are urea manufacturing and petroleum refining, with the developing markets of utilities and transportation.
Briefing:The lowest half figure ratio of a compound is revealed by the empirical formula for that molecule.
Empirical weight formula: 12 + 1 Equals 13.
Molecular weight = 78
n = Molecular weight/Empirical formula weight
n = 78.12/13
n = 6.00
Molecular formula = (CH)ₙ = CH₆ = C₆H₆
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Why does c14 have 8 neutrons?
C14 have 8 neutrons, because C have 6 atomic number and it have 14 atomic mas , where atomic mass is total of proton and neutron so the neutron of C14 is 8.
It is commonly known that Carbon-14 is an isotope of carbon. It is also known as a neutral atom. Additionally, the ratio of neutrons to protons varies among different isotopes.
The total number of protons that make up an atom's nucleus is represented by the atomic number of that atom, as is well known. We know that carbon has an atomic number of 6, a mass number of 14. It is common knowledge that mass is the product of protons and neutrons. There will thus be = 14 - 6 = 8 neutrons.
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Barrett and Drew argue about undiscovered elements. Barrett says he can’t wait until we discover element 120 in our environment. Drew argues that we will probably never discover element 120 in our environment. Based on concepts you learned in this lesson, settle their argument. Identify who is probably correct and describe why?
Based on concepts you learned in the lesson, Barrett who says he can’t wait until we discover element 120 in our environment is correct because we discover new elements everyday.
What is an Element?This is referred to as a chemical substance that cannot be broken down into other substances and examples include sodium , hydrogen etc.
We can infer from this argument that Barrett is correct because new elements are being discovered by scientists from time to time so it is false to say they won't be discovered anymore,.
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What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three significant figures? A) 7.74 B) 78.1 C) 25.4 D) 30.7 E) 28.6
The mass % of carbon in dimethyl sulfoxide (C2H6SO) rounded to three significant figure is calculated as 30.718%.
What is mass percentage?Mass percent of a solution is defined as the ratio of the mass of solute that is present in solution, relative to the mass of solution as a whole. To calculate mass percent of an element in a compound, we divide mass of the element in 1 mole of the compound by the molar mass and then multiply the result by 100.
As we know molar mass of carbon is 12 g/mol and molar mass of dimethyl sulfoxide is 78.13 g/mol
Mass % of carbon (C2) in dimethyl sulfoxide (C2H6SO) = 2* (12/78.13) * 100
= 30.718%
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1.
Which of the following best explains the
relationship between molecules and atoms?
A
Atoms are molecules that have a charge.
B
Atoms have smaller parts, called
molecules.
С
Molecules are made up of two or more
atoms.
D
Molecules are atoms that have no mass.
Estimate the net charge at pH=7. Assume the pKa values given in the table above. Term____
The net charge at pH=7. The pKa values given in the table above will term is referred as neutral.
At pH = 7, the solution is considered neutral, which means that the concentration of H+ ions is equal to the concentration of OH- ions, i.e [H+] = [OH-] = 10^-7 M.
To estimate the net charge at pH = 7, you would need to know the pKa values of the acid and the species present in the solution. It is important to note that the net charge at pH 7 will depend on the acid and species present in the solution, and the pKa values given for that specific acid. In a neutral solution, the pH is equal to 7, which means that the concentration of H+ ions is equal to the concentration of OH- ions. Since the pH is neutral, this means that the solution has no net charge. Neutral solutions contain equal concentrations of positive and negative ions, thus the net charge is zero.
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1- Give the chemical formula for trans-dichlorobis(ethylenediamine)platinum(IV). Use (en) as the symbol for ethylenediamine.
2- Give the systematic name of this coordination compound.
Na[Al(OH)4]
1.trans-[Pt(en)2Cl2]2+
2.coordination compound Na [Al (OH)] systematic name: sodium tetrahydroxidoaluminate (III)
For several industrial and technical applications, sodium aluminate serves as an efficient supply of aluminum hydroxide. A white crystalline solid with the chemical formula NaAlO2, NaAl(OH)4 (hydrated), [2] Na2OAl2O3, or Na2Al2O4, pure sodium aluminate (anhydrous) is a white substance. Both a solution and a solid form of sodium aluminate are sold commercially.Other comparable compounds, often referred to as sodium aluminate, include Na5AlO4 and Na7Al3O8, which contain complex polymeric anions and Na17Al5O16 and NaAl11O17, which was originally wrongly thought to be -alumina, a phase of aluminum oxide.Aluminum chloride, sodium chloride, and water are produced when hydrogen chloride and sodium tetrahydroxoaluminate interact. Diluted hydrogen chloride in a solution form.
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Step 4: measure the mass of the book
The book will serve as a flat surface on which you later place additional weights. It has its own mask but you need to measure.
Zero the balance. Place the book on the balance.
Measure the mass of the nearest gram (1g)
498 g
In this experiment, you will measure all masses in kilograms. Convert the books mass to kilograms
0. 498 kg
The weight of the book in kilograms is 0.498Kg.
A body's bulk is an innate characteristic. It was widely believed to be related to the volume of matter in a physical body prior to the discovery of the atom and particle physics.
You can work on a level surface provided by the book.
will eventually add more weights. It is distinctive in its own way. The mass must be measured.
the account balance to 0 the scale with the book on it. Weigh the object down to the nearest gram (1 g). 498g In this experiment, all masses will be measured in kilograms. the books weigh 0.498 kg in kilograms.
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The empirical formula for the compound having the formula H₂C₂O4 is
C₂O₂H₂
COH
COH ₂
CO₂H
C₂H₂
Answer:
CO₂H
Explanation:
The empirical formula gives the smallest whole number ratio of atoms of each element in a compound.
The ratio of hydrogen, carbon and oxygen in H₂C₂O₄ is:
H : C : O
2 : 2 : 4
They have a common factor of 2, so we can divide the atoms of each element by 2:
H : C : O
1 : 1 : 2
This gives us HCO₂ or CO₂H
Which represents the greatest mass?
• all the same
• 1.0 mol P
• 1.0 mol I
• 1.0 mol K
• 1.0 mol Al
Answer:
it is 1 mole of I is correct